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Subject: Re: A list of installed packages (no dependencies)
From: Warren Young <wyml@etr-usa.com>
In-Reply-To: <54A43EE0.8010400@cygwin.com>
Date: Wed, 31 Dec 2014 13:54:07 -0700
Message-Id: <DCB8A447-3098-4EFB-BE6B-786DB98A994A@etr-usa.com>
References: <54A3CBE4.6060203@alice.it> <54A43EE0.8010400@cygwin.com>
To: cygwin@cygwin.com
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On Dec 31, 2014, at 11:22 AM, Larry Hall (Cygwin) <reply-to-list-only-lh@cygwin.com> wrote:

> On 12/31/2014 05:11 AM, Angelo Graziosi wrote:
>> pacman -Qqe > pkglist
> 
> This sounds contradictory to what you're asking above.  If you want to
> re-install all the packages, you need the dependencies too to make a
> useful (re)install.

pacman -e lists only packages explicitly installed, leaving out packages automatically installed to satisfy dependencies.

Basically, it gives you a much shorter list than if you simply list all installed packages, without changing the result if you ask the package manager on a different, freshly-installed box to install “just” those on the shorter list.

DPKG-based OSes must maintain a similar list, because they are able to detect when an automatically-installed package is no longer needed as a result of removing the last explicitly-installed package that depended on it.  (apt-get autoremove).
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